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STM32F2 APB2Periph Clock failure?

Question asked by mai.truong_giang on Jun 13, 2012
Latest reply on Jun 13, 2012 by Clive One
Hello everyone, I'm working on STM32F207VE Kit .
Has anyone ever set the frequency to exceed the limit for APB2 (greater than 60 Mhz).

Yesterday, I had set up freqency for APB2 is 120Mhz (by my mistake).
To day, the peripherals such as USART1, ADC not work.

Now, even the demo program "USART printf" in STM32F2xx_StdPeriph_Examples" package not running, but still good before. And the periphery of ABP1 still function normally!
Was APB2 dead?, Is there any explicitly  way to test ABP2 clock source! 

Thank you!